The H+ Region Contribution to [C II] 158 Micron Emission

Abstract

The [C II] 158 micron line is an important emission line diagnostic in Photodissociation Regions (PDRs), but this emission line can also emerge from ionized gas. This work calculates the contribution of [C II] emission from ionized gas over a wide range of parameter space by considering the simplified case of an H+ region and PDR in pressure equilibrium. Additionally, these calculations also predict the strong correlation observed between [N II] 205 micron emission and [C II] discussed by previous authors. Overall, the results of these calculations have wide-ranging applications to the interpretation of [C II] emission in astrophysical environments.

arXiv comment18 pages, 7 figures, accepted for publication in the MNRAS

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• Intensity mapping of [CII] from early galaxies
• Metallicity Diagnostics with Infrared Fine-Structure Lines
• Spectroscopic FIR mapping of the disk and galactic wind of M82 with Herschel-PACS
• Planck's dusty GEMS. VI. Multi-J CO excitation and interstellar medium conditions in dusty starburst galaxies at z=2-4
• Far-infrared Herschel SPIRE spectroscopy of lensed starbursts reveals physical conditions of ionised gas
• Herschel Galactic plane survey of [NII] fine structure emission
• A clumpy-cloud PDR model of the global far-infrared line emission of the Milky Way
• Star Forming Galaxies as AGN Imposters? A Theoretical Investigation of the Mid-infrared Colors of AGNs and Extreme Starbursts
• The Herschel M33 extended survey (HerM33es): PACS spectroscopy of the star forming region BCLMP 302
• A new approach for testing variations of fundamental constants over cosmic epochs using FIR fine-structure lines
• Origin and z-distribution of Galactic diffuse [CII] emission
• Mapping metals at high redshift with far-infrared lines
• The Survey of Lines in M31 (SLIM): Investigating the Origins of [CII] Emission
• Modeling ionized gas in low-metallicity environments: the Local Group dwarf galaxy IC10
• Optically Thick [O I] and [C II] Emission Towards NGC 6334 A
• The KOSMA-$\tau$ PDR Model -- I. Recent updates to the numerical model of photo-dissociated regions
• The Origin of [CII] 158um Emission toward the HII Region Complex S235
• [CII] 158$\mu$m and [NII] 205$\mu$m emission from IC 342 - Disentangling the emission from ionized and photo-dissociated regions
• Stacked Average Far-Infrared Spectrum of Dusty Star-Forming Galaxies from the Herschel/SPIRE Fourier Transform Spectrometer
• C^+ distribution around S1 in rho Ophiuchi
• Velocity resolved [CII] spectroscopy of the center and the BCLMP302 region of M33 (HerM33es)
• The Dense Warm Ionized Medium in the Inner Galaxy
• Properties of active galactic star-forming regions probed by imaging spectroscopy with the Fourier transform spectrometer (FTS) onboard AKARI
• Testing PDR models against ISO fine structure line data for extragalactic sources
• Ionized gas in the Scutum spiral arm as traced in [N II] and [C II]
• Simulated [CII] in high-z galaxies
• Warm ISM in the Sgr A Complex. II. The [C/N] abundance ratio traced by [CII] 158 um and [NII] 205 um observations toward the Arched Filaments at the Galactic center
• A Herschel mapping of [C ii], [O i] and [O iii] lines from the circumnuclear region of M31
• The character of the warm ionised medium
• Far-infrared line and dust emission from H II regions and photodissociation regions